p {
    color: red;
    /* 不同浏览器要加前缀 */
    border-radius: 10px;
    box-sizing: border-box;
}


/* 给input内的placeholder字体设置样式 */

::placeholder {
    color: yellow;
}

.sass-box {
    height: 500px;
    width: 500px;
    background: center top url(../images/sass.png) no-repeat;
}